1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" Copyright (c) 2026 Aymeric Wibo <obiwac@freebsd.org> 4.\" 5.\" This code is derived from software contributed to Berkeley by 6.\" the American National Standards Committee X3, on Information 7.\" Processing Systems. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.Dd February 19, 2026 34.Dt ABS 3 35.Os 36.Sh NAME 37.Nm abs , 38.Nm labs , 39.Nm llabs , 40.Nm imaxabs 41.Nd return absolute value for integer types 42.Sh SYNOPSIS 43.Lb libc 44.In stdlib.h 45.Ft int 46.Fn abs "int i" 47.Ft long 48.Fn labs "long i" 49.Ft long long 50.Fn llabs "long long i" 51.In inttypes.h 52.Ft intmax_t 53.Fn imaxabs "intmax_t i" 54.Sh DESCRIPTION 55The 56.Fn abs , 57.Fn labs , 58.Fn llabs , 59and 60.Fn imaxabs 61functions compute the absolute value of 62.Fa i . 63.Sh RETURN VALUES 64The 65.Fn abs , 66.Fn labs , 67.Fn llabs , 68and 69.Fn imaxabs 70functions return the absolute value. 71.Sh SEE ALSO 72.Xr cabs 3 , 73.Xr fabs 3 , 74.Xr floor 3 , 75.Xr hypot 3 76.Sh STANDARDS 77The 78.Fn abs , 79.Fn labs , 80.Fn llabs , 81and 82.Fn imaxabs 83functions conform to 84.St -isoC-2023 85and 86.St -p1003.1-2024 . 87.Sh HISTORY 88The 89.Fn abs 90function first appeared in 91.At v6 . 92The 93.Fn labs 94function first appeared in 95.Bx 4.3 . 96The 97.Fn llabs 98and 99.Fn imaxabs 100functions first appeared in 101.Fx 5.0 . 102.Sh BUGS 103The absolute value of the most negative integer remains negative. 104